EP1540322A1 - Interchangeable fitting comprising a sensor - Google Patents

Interchangeable fitting comprising a sensor

Info

Publication number
EP1540322A1
EP1540322A1 EP03793822A EP03793822A EP1540322A1 EP 1540322 A1 EP1540322 A1 EP 1540322A1 EP 03793822 A EP03793822 A EP 03793822A EP 03793822 A EP03793822 A EP 03793822A EP 1540322 A1 EP1540322 A1 EP 1540322A1
Authority
EP
European Patent Office
Prior art keywords
sensor
locking
insert
immersion tube
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03793822A
Other languages
German (de)
French (fr)
Other versions
EP1540322B1 (en
Inventor
Daniel Caderas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mettler Toledo GmbH Germany
Original Assignee
Mettler Toledo Schweiz GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mettler Toledo Schweiz GmbH filed Critical Mettler Toledo Schweiz GmbH
Publication of EP1540322A1 publication Critical patent/EP1540322A1/en
Application granted granted Critical
Publication of EP1540322B1 publication Critical patent/EP1540322B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/283—Means for supporting or introducing electrochemical probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N1/12—Dippers; Dredgers

Definitions

  • the invention relates to a retractable fitting with a sensor according to the preamble of claim 1.
  • a retractable fitting of the type mentioned at the outset is, for example, from EP 0
  • the retractable fitting described therein contains a sensor which is removably arranged in an immersion tube, which is axially displaceable in a housing between a retracted rest position and an extended working position in order to bring the front part of the sensor into contact with a measuring medium.
  • the sensor forms a medium-tight closure of the dip tube, for example by means of an annular seal arranged between the dip tube and the sensor housing.
  • the known retractable fitting Since extending the immersion tube from the rest position into the working position when the sensor is not installed, because of the lack of a medium-tight seal, this can cause an undesired escape of the measuring medium into the empty immersion tube and other parts of the retractable fitting, the known retractable fitting is equipped with a safety device that a axial displacement of the dip tube is prevented when the sensor is not inserted.
  • the sensor is screwed into a corresponding internal thread of the dip tube by means of an external thread located in the rear shaft area.
  • a sleeve-like safety slide arranged coaxially in the interior of the immersion tube is brought from a blocking position into a release position with respect to the axial movement of the immersion tube.
  • This principle of operation means that the length of the immersion tube must essentially correspond to the length of the sensor.
  • the stroke length of the dip tube ie the distance between the retracted rest position and the maximum extended position of the dip tube, is inevitably less than the length of the dip tube, that is achievable stroke length limited by the length of the sensor. Accordingly, for example, a sensor of the very common length of 12 cm with a retractable fitting of the known type can be extended by a little less than 12 cm, which is, however, inadequate for numerous applications, for example for measurements in large reaction vessels.
  • EP 0 106 858 B1 describes a retractable fitting in which a sensor is housed in an immersion tube, which can be considerably longer than the sensor.
  • the sensor protrudes with its measuring tip from the front, open end of the immersion tube.
  • the housing part which can be connected to a reaction vessel has a perforated cage at the front end, in which the front part of the immersion tube and in particular the sensor tip protruding therefrom is advanced in order to reach the extended measuring position.
  • a spring arranged in the cage biases the dip tube into the retracted rest position and
  • the stroke length is not limited by the sensor length; however, the stroke length is limited by the usable path of the biasing spring, which is a considerable disadvantage in practice.
  • Another disadvantage o is that the closure member must be opened by means of the sensor or its holder when the sensor is extended into the measuring position, the front end of the sensor or holder then pressing the closure member against the force of the biasing spring.
  • the sensor at the front end must be designed to be particularly robust or the holder with a front end
  • the object of the invention is to provide an improved retractable fitting, in particular to avoid the disadvantages mentioned above.
  • retractable fitting defined in claim 1. 5
  • the immersion tube contains a removable insert that can be fixed by means of a closure element, by means of which the sensor is pushed in the inserted position against a front stop of the immersion tube, allows the total length of the immersion tube and thus also the stroke length between the retracted rest position and. extended working position much longer than
  • the sensor length can be designed.
  • the insert can have different shapes and can be rod-shaped, for example.
  • the insert is tubular and also has a front end face against an associated rear end face of the sensor, preferably on the sensor shaft.
  • a compact design of the retractable fitting is defined in claim 3, according to which the closure member can be inserted at the rear end of the immersion tube and holds the insert on the sensor and the latter on the front stop in the inserted position. 5
  • the retractable fittings according to claim 4 and 5 are particularly preferred with regard to the design of the safety device.
  • the safety device has a safety slide encompassing the rear end of the insert in the manner of a sleeve. This is between
  • the safety slide interacts with a locking member which is arranged radially displaceably in the dip tube. In the locked position of the safety slide, the locking member stands with its inside on the jacket of the
  • the safety slide is biased by a first spring against the rear end of the dip tube and is present on a rear flange of the insert when used.
  • a second spring is arranged on the closure member, by means of which the insert is pretensioned against the front end of the dip tube, the whole in such a way that:
  • the insert, the second spring and the closure member are each provided with a continuous lateral recess, the installation and removal of the sensor is facilitated.
  • This is particularly suitable for sensors which have a connecting cable with comparatively bulky plug connections which do not permit threading into the tubular insert.
  • a front part of the housing contains a flushing area with an inlet and an outlet for flushing medium.
  • rinsing medium is not only to be understood as an actual rinsing liquid such as water, but also cleaning media as used for so-called CIP cleaning ("Cleaning In Place"), or for example calibration liquids, purging gas and the like.
  • CIP cleaning Cleaning In Place
  • the rinsing area is delimited by a front and a rear ring seal which, together with associated outer jacket parts of the dip tube, form medium-tight seals.
  • the dip tube is closed at the front end and has at least one lateral opening which is in a rinsing position of the dip tube between the front and rear ring seals. This also protects the sensor from mechanical influences even when the dip tube is extended, since it does not protrude from the end of the dip tube.
  • the rinsing position of the immersion tube preferably corresponds to the retracted rest position.
  • the immersion tube has a section designed as a piston, which is displaceably mounted in a cylindrical section of the housing between the retracted rest position and the extended working position. Suitable slide bearings ensure a guided, low-friction longitudinal displaceability, thanks to which in particular a mechanical load on the ring seals arranged between the housing and the dip tube is avoided.
  • the retractable fitting can be provided for manual operation, but according to claim 12 it has a drive device operated by means of fluid, for example compressed air or hydraulic oil, for axially displacing the immersion tube.
  • fluid for example compressed air or hydraulic oil
  • Figure 1 shows a retractable fitting with immersion tube in the retracted rest position, in longitudinal section; ,O
  • Figure 2 shows the retractable fitting of Figure 1, with a dip tube in the extended working position, in longitudinal section;
  • Figure 3 shows the front part of the retractable fitting of Figure 1, in an enlarged .5 view
  • Figure 4 shows the rear part of the retractable fitting of Figure 1, in an enlarged view
  • FIG. 5 shows the rear end area of a quick-change fitting in the absence of a locking member, in a longitudinal section
  • FIG. 6 shows the rear end area of FIG. 5, when not in use, in a longitudinal section
  • FIG. 7 shows the rear end area of FIG. 5, with the closure member present and the sensor missing, in longitudinal section;
  • FIG. 8 shows the rear end region of FIG. 5, in the operational state, in a longitudinal section.
  • the retractable fitting shown in Figures 1 to 4 contains a sensor 2, which is removably arranged in the front part 4 of an immersion tube 6.
  • the dip tube 6 and thus the sensor 2 are axially displaceable with respect to a housing 8 between a retracted rest position and an extended work position.
  • the dip tube 6 and the sensor 2 are located within the housing 8;
  • the immersion tube 6 with the sensor 2 is extended and immersed in a reaction vessel (not shown in more detail) in order to determine measured values in a medium located therein.
  • a front jacket section 10 of the sensor 2 and an O-ring 12 embedded in the front part 4 of the immersion tube 6 form a medium-tight closure of the immersion tube 6.
  • the immersion tube 6 contains a removable, tube-like insert 16 which can be fixed by means of a closure member 14 and by means of which the Sensor 2 is inserted in the inserted position against a front stop 18 of the dip tube 6.
  • this front stop 18 is formed by a step-like narrowing in the interior of the dip tube 6, against which the sensor 2 abuts with a projection 20 of the sensor shaft 22.
  • the closure member 14 can be inserted and held at the rear end 24 of the dip tube 6 in the inserted position, insert 16 on sensor 2 and the latter on front stop 18.
  • the retractable assembly is also equipped with a securing device 26 which prevents the immersion tube 6 from being axially displaced from the rest position if at least one of the components: sensor 2, insert 16 and closure member 14 is missing.
  • the housing 8 is composed of several tubular components, namely a front chamber part 28, a middle chamber part 30, a cylindrical housing part 32 and a rear housing part 34.
  • the individual chamber parts are connected to each other by connecting flanges and fastening screws.
  • the dip tube 6 has a cage 36 at the front end, which is provided with at least one lateral passage opening 38, in order to ensure the access of the measuring medium to the sensor 2 in the extended measuring position.
  • the cage 36 at the front end, which is provided with at least one lateral passage opening 38, in order to ensure the access of the measuring medium to the sensor 2 in the extended measuring position.
  • the cage 36 is welded to a central dip tube part 42, in the
  • Inner wall of said front stop 18 is formed for the sensor 2.
  • the middle dip tube part 42 is connected to a piston 44, which is mounted so as to be longitudinally displaceable in the cylindrical housing part 32.
  • the middle dip tube part 42 On the opposite side of the middle dip tube part 42
  • Piston 44 is a rear dip tube part 46 which is located at the rear end
  • a receptacle for the closure member 14 is equipped with a receptacle for the closure member 14.
  • a plurality of slide bearings 48 is provided between interacting parts of the housing 8 and the immersion tube 6.
  • the front chamber part 28 is equipped with a connecting flange 50, by means of which the retractable fitting can be connected to a reaction vessel. Since the front chamber part 28 is designed as a component of the modularly constructed housing 8, the retractable fitting can be attached to reaction vessels Connect different connection dimensions by using a front chamber part 28 with a correspondingly dimensioned connection flange 50.
  • the front chamber part 28 is designed as part of a flushing device for the sensor 2.
  • the front chamber part 28 has a flushing area 56 delimited by a front ring groove 52 and a rear ring groove 54, the peripheral wall 58 of which has at least one inlet 60 and one outlet 62 for flushing medium.
  • a corresponding sealing ring In each annular groove there is a corresponding sealing ring, which forms a medium-tight closure of the flushing area 56 with the outer wall of the immersion tube 6.
  • the cage 36 In the retracted rest position of the immersion tube 6, which also corresponds to a rinsing position for the sensor 2, the cage 36 is located within the rinsing area 56.
  • rinsing medium supplied through the inlet 60 can reach the sensor 2 located therein through the lateral passage opening 38 of the cage 36.
  • An escape of flushing medium into the retractable fitting is prevented by the O-ring 12 arranged between the jacket 10 of the sensor 2 and the inner wall of the dip tube 6.
  • the rinsing area 56 is limited to the space between the outer ring of the dip tube 6 and the peripheral wall 58 between the two annular grooves 52 and 54.
  • the inlet 60 and the outlet 62 are expediently provided with an internally threaded section into which a corresponding connecting part or, as shown in FIGS. 1 to 3, a sealing plug can be screwed.
  • the latter is useful, for example, for performing leak tests.
  • rinsing medium is not only to be understood as an actual rinsing liquid such as water. Rather, depending on the application, this term also includes various cleaning media, such as those used for so-called CIP cleaning ("Cleaning In Place"). Furthermore, it can be water vapor, purge gases, or also trade calibration fluids.
  • a device for treating the sensor can be connected to the inlet 60 and possibly also to the outlet 62, which device allows, for example, a whole sequence of cleaning, rinsing and calibration steps. In addition, more than one inlet or outlet can be provided if required.
  • the sensor 2 has a rear plug head with electrical connections, onto which a corresponding connection socket 64 with a connection cable 66 is attached.
  • the connection socket 64 which tapers in steps towards the rear, is behind a correspondingly graduated mouth 68 of the insert 16, the connection cable 66 in the insert 16 being guided to the rear end 24 of the immersion tube 6 and out there through the closure member 14.
  • the insert 16 holds the sensor 2 against the front stop 18 of the dip tube 6.
  • the sensor 2 and insert 16 are not only to be matched in terms of shape but also in terms of length such that their combined length corresponds approximately to the length of the dip tube.
  • the securing device 26 which prevents the immersion tube 6 from moving axially out of the rest position when the sensor 2 or the insert 16 or the closure member 14 or a plurality of these components is missing, is constructed as follows.
  • the rear immersion tube part 46 contains a safety slide 70 which surrounds the tubular insert 16 at its rear end region 72 in a sleeve-like manner.
  • the safety slide 70 is displaceable between a front stop and a rear stop within the rear dip tube part 46 from a first locking position S1 via a release position F to a second locking position S2.
  • the front stop is formed by a shoulder-like constriction 74 in the interior of the rear dip tube part 46
  • the rear stop is formed by a pin 76 screwed or otherwise fastened into the wall of the rear dip tube part 46.
  • the outer side wall of the safety slide 70 is a backdrop 78 for a plurality of Designed locking member 80.
  • Each locking member 80 consists of a ball which is arranged radially displaceably in an associated through hole in the rear dip tube part 46.
  • the locking slide 70 is in contact with the rear stop 76, with each locking member 80 resting against the front locking area 84 of the link 78 with its inside and thereby engaging with its outside in a locking recess 86 of the housing 8.
  • the locking recess 86 is formed as an annular groove on the inner wall of the rear housing part 34. The axial displacement of the dip tube 6 relative to the housing 8 is blocked by this engagement.
  • the safety slide 70 is in contact with the stop 74 on the front, each locking member 80 being in contact with the rear locking area 88 of the link 78 with its inside and thereby in turn engaging with the outside in the locking recess 86.
  • the safety slide 70 is located in the area between the two stops 74 and 76, so that each locking member 80 engages with the inside in a central circumferential groove 90 of the link 78 and thereby comes out of the locking recess 86 with its outside, thereby removing the axial
  • the safety slide 70 is pretensioned against the rear end 24 of the dip tube 6 by means of a first spring 92 and is present on a rear flange 94 25 of the insert 16 when the insert 16 is present.
  • a second spring 96 is also arranged on the closure member 14, by means of which the insert 16 and thus also the safety slide 70 is biased against the front end of the immersion tube 6. This results in the mode of operation of the safety device explained below.
  • the safety slide 70 is - regardless of whether the sensor 2 is installed or not - by the action of the first spring 92 against the rear stop 76, i.e. held in the first blocking position S1, in which the front blocking area 84 faces the blocking members 80 (FIG. 6).
  • the second spring 96 is present, but remains ineffective due to the lack of an insert 16.
  • the securing device 26 responds not only to missing, but also to incorrectly installed or incorrectly dimensioned components. This is explained in more detail below.
  • the front stop 18 has no effect, i.e. the safety slide 70 reaches the first blocking position S1. If the sensor is too long, on the other hand, the insert 16 cannot be advanced far enough to reach the release position F, so that the safety slide 70 remains in the second blocking position S2. The same applies to use that is too short or too long 16.
  • the rear closure member 14 is provided with a laterally projecting pin 98 which engages in an associated L-shaped insertion slot 100 at the rear end 24 of the dip tube 6.
  • a laterally projecting pin 98 engages in an associated L-shaped insertion slot 100 at the rear end 24 of the dip tube 6.
  • the tubular insert 16, the second spring 96 and the closure member 14 are each provided with a continuous lateral recess.
  • this recess is brought about by a known, non-rotating arrangement of the spring windings, while it is designed as a continuous lateral slot in the insert 16 and in the closure member 14. Since the connecting cable 66 can be inserted into the slotted components from the side without threading, sensors with bulky plug connections, attached preamplifiers and the like can also be inserted into the retractable fitting, for example.
  • the retractable fitting is expediently equipped with an anti-rotation lock which prevents the dip tube from rotating about its longitudinal axis.
  • the rear dip tube part 46 is provided with a projection which engages in an associated longitudinal slot of the rear housing part 34.
  • this allows a defined alignment of the passage openings 38 in the cage 36 with respect to the inflows and outflows of the washing area 56.
  • the rotation lock ensures that when a non-rotationally symmetrical sensor is used, its sensitive surface has a desired orientation, for example with respect to a flow direction in the reaction vessel.
  • the longitudinal displacement of the piston 44 in the cylindrical housing part 32 can be carried out manually or by means of a suitable hydraulic device, which is operated, for example, with compressed air, hydraulic oil, water or another suitable fluid.
  • Position feedback devices are also expediently provided, by means of which the longitudinal position of the dip tube can be determined.
  • the rear end 24 of the immersion tube 6 and the closure member 14 inserted therein are in the extended working position inside the rear housing part 34, so that the closure member 14 is not easily accessible. This prevents inadvertent removal of the closure member 14 in the extended working position. In the case of a pressurized reaction vessel in particular, this represents an additional safeguard against undesired escape of the reaction medium.
  • retractable fitting has been shown in a horizontal installation position, it can basically also be used for a vertical installation position with the sensor part pointing downwards and for installation positions in between. LIST OF REFERENCE NUMBERS

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  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Cable Accessories (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Actuator (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Measuring Fluid Pressure (AREA)
  • Fire Alarms (AREA)

Abstract

A probe-holder armature contains a sensor probe that is removably arranged in the forward portion of an immersion tube which is axially movable in a housing between a retracted rest position and a deployed working position. The sensor probe in its installed condition forms a medium-tight closure of the immersion tube. The immersion tube contains a removable insert which can be held in a fixed position by means of a closure member. By means of the insert, the sensor probe in its installed position is pushed forward against a forward stop of the immersion tube. A safety device prevents an axial movement of the immersion tube out of its rest position if one or more of the three components sensor probe, insert and closure member are missing.

Description

Wechselarmatur mit einem SensorRetractable fitting with one sensor
Technisches GebietTechnical field
Die Erfindung betrifft eine Wechselarmatur mit einem Sensor gemäss dem Oberbegriff des Anspruches 1.The invention relates to a retractable fitting with a sensor according to the preamble of claim 1.
Stand der TechnikState of the art
Eine Wechselarmatur der eingangs genannten Art ist beispielsweise aus der EP 0A retractable fitting of the type mentioned at the outset is, for example, from EP 0
882 896 A1 bekannt. Die dort beschriebene Wechselarmatur enthält einen Sensor, der herausnehmbar in einem Tauchrohr angeordnet ist, welches in einem Gehäuse zwischen einer eingefahrenen Ruhestellung und einer ausgefahrenen Arbeitsstellung axial verschiebbar ist, um das Sensorvorderteil in Kontakt mit einem Messmedium zu bringen. In eingesetzter Lage bildet der Sensor einen mediumdichten Abschluss des Tauchrohres, beispielsweise mittels einer zwischen Tauchrohr und Sensorgehäuse angeordneten Ringdichtung. Da ein Ausfahren des Tauchrohres von der Ruhestellung in die Arbeitsstellung bei nicht eingebautem Sensor wegen des dann nicht vorhandenen mediumdichten Abschlusses einen unerwünschten Austritt von Messmedium in das leere Tauchrohr und weitere Teile der Wechselarmatur verursachen kann, ist die bekannte Wechselarmatur mit einer Sicherungsvorrichtung ausgestattet, die ein axiales Verschieben des Tauchrohres bei nicht eingesetztem Sensor verhindert.882 896 A1 known. The retractable fitting described therein contains a sensor which is removably arranged in an immersion tube, which is axially displaceable in a housing between a retracted rest position and an extended working position in order to bring the front part of the sensor into contact with a measuring medium. In the inserted position, the sensor forms a medium-tight closure of the dip tube, for example by means of an annular seal arranged between the dip tube and the sensor housing. Since extending the immersion tube from the rest position into the working position when the sensor is not installed, because of the lack of a medium-tight seal, this can cause an undesired escape of the measuring medium into the empty immersion tube and other parts of the retractable fitting, the known retractable fitting is equipped with a safety device that a axial displacement of the dip tube is prevented when the sensor is not inserted.
Bei der Wechselarmatur gemäss der EP 0 882 896 A1 ist der Sensor mittels eines im hinteren Schaftbereich befindlichen Aussengewindes in ein entsprechendes Innengewinde des Tauchrohres eingeschraubt. Beim Einschrauben des Sensors wird ein koaxial im Inneren des Tauchrohres angeordneter hülsenartiger Sicherungsschieber von einer Sperrstellung in eine Freigabestellung bezüglich der axialen Bewegung des Tauchrohres gebracht. Bei diesem Funktionsprinzip ergibt sich, dass die Länge des Tauchrohres im Wesentlichen der Länge des Sensors entsprechen muss. Da jedoch die Hublänge des Tauchrohres, d.h. der Abstand zwischen der eingefahrenen Ruhestellung und der maximal ausgefahrenen Stellung des Tauchrohres zwangsläufig kleiner als die Länge des Tauchrohres ist, ist die erreichbare Hublänge durch die Länge des Sensors begrenzt. Demnach lässt sich beispielsweise ein Sensor der sehr gebräuchlichen Länge von 12 cm mit einer Wechselarmatur der bekannten Art maximal um etwas weniger als 12 cm ausfahren, was jedoch für zahlreiche Anwendungen, beispielsweise für Messungen in grossen Reaktionsgefässen, unzureichend ist.In the retractable fitting according to EP 0 882 896 A1, the sensor is screwed into a corresponding internal thread of the dip tube by means of an external thread located in the rear shaft area. When the sensor is screwed in, a sleeve-like safety slide arranged coaxially in the interior of the immersion tube is brought from a blocking position into a release position with respect to the axial movement of the immersion tube. This principle of operation means that the length of the immersion tube must essentially correspond to the length of the sensor. However, since the stroke length of the dip tube, ie the distance between the retracted rest position and the maximum extended position of the dip tube, is inevitably less than the length of the dip tube, that is achievable stroke length limited by the length of the sensor. Accordingly, for example, a sensor of the very common length of 12 cm with a retractable fitting of the known type can be extended by a little less than 12 cm, which is, however, inadequate for numerous applications, for example for measurements in large reaction vessels.
In der EP 0 106 858 B1 ist eine Wechselarmatur beschrieben, bei der ein Sensor in einem Tauchrohr untergebracht ist, das wesentlich länger als der Sensor sein kann. Der Sensor ragt dabei mit seiner Messspitze aus dem vorderen, offenen Ende des ι Tauchrohres heraus. Das mit einem Reaktionsgefass verbindbare Gehäuseteil weist am vorderen Ende einen durchbrochenen Käfig auf, in welchen der vordere Teil des Tauchrohres und insbesondere die aus diesem herausragende Sensorspitze vorgeschoben wird, um die ausgefahrene Messstellung zu erreichen. Eine im Käfig angeordnete Feder spannt das Tauchrohr in die eingefahrene Ruhestellung vor undEP 0 106 858 B1 describes a retractable fitting in which a sensor is housed in an immersion tube, which can be considerably longer than the sensor. The sensor protrudes with its measuring tip from the front, open end of the immersion tube. The housing part which can be connected to a reaction vessel has a perforated cage at the front end, in which the front part of the immersion tube and in particular the sensor tip protruding therefrom is advanced in order to reach the extended measuring position. A spring arranged in the cage biases the dip tube into the retracted rest position and
5 hält dabei ein vorderes Verschlussglied des Tauchrohres in Schliessstellung, d.h. beim Ausfahren des Tauchrohres ist die Vorspannkraft der Feder zu überwinden. Bei dieser Wechselaramatur ist die Hublänge zwar nicht durch die Sensorlänge begrenzt; allerdings ist die Hublänge durch den nutzbaren Weg der Vorspannfeder begrenzt, was in der Praxis einen erheblichen Nachteil darstellt. Ebenfalls nachteilig o ist es, dass das Öffnen des Verschlussgliedes mittels des Sensors oder dessen Halter zu erfolgen hat, wenn der Sensor in die Messstellung ausgefahren wird, wobei dann das vordere Ende des Sensors bzw. des Halters das Verschlussglied entgegen der Kraft der Vorspannfeder aufdrückt. Somit muss der Sensor am vorderen Ende besonders widerstandsfähig ausgebildet sein oder der Halter mit einem vorderen5 holds a front closure member of the dip tube in the closed position, i.e. When the immersion tube is extended, the spring preload must be overcome. With this interchangeable valve, the stroke length is not limited by the sensor length; however, the stroke length is limited by the usable path of the biasing spring, which is a considerable disadvantage in practice. Another disadvantage o is that the closure member must be opened by means of the sensor or its holder when the sensor is extended into the measuring position, the front end of the sensor or holder then pressing the closure member against the force of the biasing spring. Thus, the sensor at the front end must be designed to be particularly robust or the holder with a front end
.5 Stössel versehen sein, der das Verschlussglied aufdrückt. Ein solcher Stössel ist ein zusätzliches Bauteil und kann zudem den Messvorgang der Sonde behindern. Ausserdem ist die im Käfig befindliche Feder der Verschmutzung durch das Messmedium ausgesetzt und nur schwer zu reinigen. Ein weiterer, gravierender Nachteil der Wechselarmatur gemäss der EP 0 106 858 B1 ist zudem, dass diese o keinerlei Sicherung gegenüber einem Ausfahren bei fehlendem Sensor aufweist. Darstellunα der Erfindung.5 be provided with a plunger that presses on the closure member. Such a plunger is an additional component and can also hinder the measuring process of the probe. In addition, the spring in the cage is exposed to contamination from the measuring medium and is difficult to clean. Another serious disadvantage of the retractable fitting according to EP 0 106 858 B1 is that it does not have any protection against being extended when the sensor is missing. Representation of the invention
Aufgabe der Erfindung ist es, eine verbesserte Wechselarmatur anzugeben, um insbesondere die oben genannten Nachteile zu vermeiden.The object of the invention is to provide an improved retractable fitting, in particular to avoid the disadvantages mentioned above.
Gelöst wird diese Aufgabe durch die im Anspruch 1 definierte Wechselarmatur. 5 Diese beinhaltet einen Sensor, der herausnehmbar im Vorderteil eines Tauchrohres angeordnet ist, das in einem Gehäuse zwischen einer eingefahrenen Ruhestellung und einer ausgefahrenen Arbeitsstellung axial verschiebbar ist, wobei der Sensor in eingesetzter Lage einen mediumdichten Abschluss des Tauchrohres bildet.This problem is solved by the retractable fitting defined in claim 1. 5 This includes a sensor which is removably arranged in the front part of an immersion tube and which can be axially displaced in a housing between a retracted rest position and an extended working position, the sensor in the inserted position forming a medium-tight closure of the immersion tube.
o Dadurch, dass das Tauchrohr einen herausnehmbaren, mittels eines Verschlussgliedes fixierbaren Einsatz enthält, mittels welchem der Sensor in eingesetzter Lage gegen einen vorderen Anschlag des Tauchrohres vorgeschoben ist, kann die Gesamtlänge des Tauchrohres und damit auch die Hublänge zwischen eingefahrener Ruhestellung und. ausgefahrener Arbeitsstellung wesentlich länger also The fact that the immersion tube contains a removable insert that can be fixed by means of a closure element, by means of which the sensor is pushed in the inserted position against a front stop of the immersion tube, allows the total length of the immersion tube and thus also the stroke length between the retracted rest position and. extended working position much longer than
5 die Sensorlänge gestaltet sein.5 the sensor length can be designed.
Dadurch dass eine Sicherungsvorrichtung vorhanden ist, die ein axiales Verschieben des Tauchrohres aus der Ruhestellung verhindert, wenn mindestens eines der Bauteile: Sensor, Einsatz und Verschlussglied fehlt, wird eine umfassendeThe fact that a safety device is present which prevents the immersion tube from being axially displaced from the rest position if at least one of the components: sensor, insert and closure member is missing, becomes a comprehensive one
»o Betriebssicherheit gegenüber einer versehentlichen Manipulation der Wechselarmatur bei einem fehlendem Bauteil erreicht. Insbesondere lässt sich bei an einem Reaktionsgefass oder dergleichen angeschlossener Wechselarmatur verhindern, dass bei einem - beispielsweise wegen Wartung oder Austausch - nicht eingebauten Bauteil ein unbedachtes Verschieben des Tauchrohres mit nachteiligen»O Operational safety against inadvertent manipulation of the retractable fitting achieved with a missing component. In particular, when the retractable fitting is connected to a reaction vessel or the like, it can be prevented that a component that is not installed — for example, due to maintenance or replacement — can cause unintentional displacement of the immersion tube
_5 Folgen vorgenommen wird._5 episodes is made.
Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen definiert.Advantageous embodiments of the invention are defined in the dependent claims.
30 Grundsätzlich kann der Einsatz verschiedenen Formen haben und beispielsweise stabförmig sein. Gemäss Anspruch 2 ist der Einsatz rohrartig ausgebildet und weist zudem eine vordere Stirnseite auf, die gegen eine zugeordnete rückwärtige Stirnseite des Sensors, vorzugsweise am Sensorschaft, ansteht. Eine kompakte Bauweise der Wechselarmatur ist im Anspruch 3 definiert, wonach das Verschlussglied am hinteren Ende des Tauchrohres einsetzbar ist und in eingesetzter Stellung den Einsatz am Sensor und letzteren am vorderen Anschlag hält. 5 Die Wechselarmaturen nach Anspruch 4 und 5 sind hinsichtlich der Ausgestaltung der Sicherungsvorrichtung besonders bevorzugt.30 Basically, the insert can have different shapes and can be rod-shaped, for example. According to claim 2, the insert is tubular and also has a front end face against an associated rear end face of the sensor, preferably on the sensor shaft. A compact design of the retractable fitting is defined in claim 3, according to which the closure member can be inserted at the rear end of the immersion tube and holds the insert on the sensor and the latter on the front stop in the inserted position. 5 The retractable fittings according to claim 4 and 5 are particularly preferred with regard to the design of the safety device.
Gemäss Anspruch 4 weist die Sicherungsvorrichtung einen das hintere Ende des Einsatzes hülsenartig umgreifenden Sicherungsschieber auf. Dieser ist zwischenAccording to claim 4, the safety device has a safety slide encompassing the rear end of the insert in the manner of a sleeve. This is between
[0 einem frontseitigen und einem rückseitigen Anschlag innerhalb des Tauchrohres von einer ersten Sperrstellung über eine Freigabestellung zu einer zweiten Sperrstellung verschiebbar. Der Sicherungsschieber wirkt dabei mit einem Sperrglied zusammen, das radial verschieblich im Tauchrohr angeordnet ist. In Sperrstellung des Sicherungsschiebers steht das Sperrglied mit seiner Innenseite am Mantel des[0 a front and a rear stop within the dip tube from a first locking position via a release position to a second locking position. The safety slide interacts with a locking member which is arranged radially displaceably in the dip tube. In the locked position of the safety slide, the locking member stands with its inside on the jacket of the
[5 Sicherungsschiebers an und greift mit seiner Aussenseite in eine Sperrausnehmung im Gehäuse ein; in Freistellung des Sicherungsschiebers greift das Sperrglied mit der Innenseite in eine Umfangsnut im Sicherungsschieber ein und kommt mit seiner Aussenseite aus der Sperrausnehmung des Gehäuses frei.[5 safety slide on and engages with its outside in a locking recess in the housing; when the safety slide is released, the inside of the locking member engages in a circumferential groove in the safety slide and its outside comes free from the locking recess of the housing.
>o Gemäss Anspruch 5 ist der Sicherungsschieber mittels einer ersten Feder gegen das hintere Ende des Tauchrohres vorgespannt und steht bei vorhandenem Einsatz an einem hinteren Flansch des Einsatzes an. Am Verschlussglied ist eine zweite Feder angeordnet, mittels welcher der Einsatz gegen das vordere Ende des Tauchrohres vorgespannt ist, das Ganze derart, dass:> o According to claim 5, the safety slide is biased by a first spring against the rear end of the dip tube and is present on a rear flange of the insert when used. A second spring is arranged on the closure member, by means of which the insert is pretensioned against the front end of the dip tube, the whole in such a way that:
15 a) bei fehlendem Verschlussglied der Sicherungsschieber mit einem vorderen Sperrbereich dem Sperrglied gegenüber steht;15 a) in the absence of a locking member, the safety slide with a front locking area faces the locking member;
b) bei fehlendem Einsatz der Sicherungsschieber mit dem vorderen Sperrbereich 30 dem Sperrglied gegenüber steht; c) bei vorhandenem Verschlussglied und fehlendem Sensor der Sicherungsschieber mit einem hinteren Sperrbereich dem Sperrglied gegenüber steht; undb) in the absence of use of the safety slide with the front locking area 30 opposite the locking member; c) if the locking element is present and the sensor is missing, the safety slide with a rear locking area faces the locking element; and
d) in betriebsbereitem Zustand der Sicherungsschieber mit einer mittigen Umfangsnut dem Sperrglied gegenüber steht.d) in the operational state of the safety slide with a central circumferential groove opposite the locking member.
Dadurch, dass gemäss Anspruch 6 der Einsatz, die zweite Feder und das Verschlussglied je mit einer durchgehenden seitlichen Ausnehmung versehen sind, wird der Ein- und Ausbau des Sensors erleichtert. Besonders geeignet ist dies für Sensoren, die ein Verbindungskabel mit vergleichsweise sperrigen Steckeranschlüssen aufweisen, welche ein Einfädeln in den rohrartigen Einsatz nicht erlauben.The fact that the insert, the second spring and the closure member are each provided with a continuous lateral recess, the installation and removal of the sensor is facilitated. This is particularly suitable for sensors which have a connecting cable with comparatively bulky plug connections which do not permit threading into the tubular insert.
Gemäss Anspruch 7 beinhaltet ein vorderer Teil des Gehäuses einen Spülbereich mit einem Zulauf und einem Ablauf für Spülmedium. Unter Spülmedium ist im vorliegenden Zusammenhang nicht nur eine eigentliche Spülflüssigkeit wie beispielsweise Wasser zu verstehen, sondern auch Reinigungsmedien wie sie für die sogenannte CIP-Reinigung (engl. "Cleaning In Place") verwendet werden, oder beispielsweise Kalibrierungsflüssigkeiten, Spülgas und dergleichen. Vorteilhafterweise ist gemäss Anspruch 8 der Spülbereich durch eine vordere und eine hintere Ringdichtung begrenzt, welche zusammen mit zugeordneten äusseren Mantelteilen des Tauchrohres mediumdichte Abschlüsse bilden. Eine platzsparende Bauweise ergibt sich gemäss Anspruch 9, wonach das Tauchrohr am vorderen Ende abgeschlossen ist und mindestens eine seitliche Öffnung aufweist, welche in einer Spülstellung des Tauchrohres zwischen der vorderen und hinteren Ringdichtung liegt. Damit ist zudem der Sensor auch in ausgefahrener Stellung des Tauchrohres vor mechanischen Einwi rkungen geschützt, da er nicht aus dem Tauchrohrende vorsteht. Vorzugsweise entspricht gemäss Anspruch 10 die Spülstellung des Tauchrohres der eingefahrenen Ruhestellung. In der Ausgestaltung nach Anspruch 11 weist das Tauchrohr einen als Kolben ausgebildeten Abschnitt auf, der in einem zylinderförmigen Abschnitt des Gehäuses zwischen der eingefahrenen Ruhestellung und der ausgefahrenen Arbeitsstellung verschiebbar gelagert ist. Durch geeignete Gleitlager ist dabei eine geführte, 5 reibungsarm Längsverschiebbarkeit gewährleistet, dank welcher insbesondere eine mechanische Belastung der zwischen Gehäuse und Tauchrohr angeordneten Ringdichtungen vermieden wird.According to claim 7, a front part of the housing contains a flushing area with an inlet and an outlet for flushing medium. In the present context, rinsing medium is not only to be understood as an actual rinsing liquid such as water, but also cleaning media as used for so-called CIP cleaning ("Cleaning In Place"), or for example calibration liquids, purging gas and the like. Advantageously, according to claim 8, the rinsing area is delimited by a front and a rear ring seal which, together with associated outer jacket parts of the dip tube, form medium-tight seals. A space-saving design results according to claim 9, according to which the dip tube is closed at the front end and has at least one lateral opening which is in a rinsing position of the dip tube between the front and rear ring seals. This also protects the sensor from mechanical influences even when the dip tube is extended, since it does not protrude from the end of the dip tube. According to claim 10, the rinsing position of the immersion tube preferably corresponds to the retracted rest position. In the embodiment according to claim 11, the immersion tube has a section designed as a piston, which is displaceably mounted in a cylindrical section of the housing between the retracted rest position and the extended working position. Suitable slide bearings ensure a guided, low-friction longitudinal displaceability, thanks to which in particular a mechanical load on the ring seals arranged between the housing and the dip tube is avoided.
Grundsätzlich kann die Wechselarmatur für den Handbetrieb vorgesehen sein, o Gemäss Anspruch 12 weist sie jedoch eine mittels Fluid, beispielsweise Druckluft oder Hydrauliköl, betriebene Antriebsvorrichtung zum axialen Verschieben des Tauchrohres auf.In principle, the retractable fitting can be provided for manual operation, but according to claim 12 it has a drive device operated by means of fluid, for example compressed air or hydraulic oil, for axially displacing the immersion tube.
Kurze Beschreibung der Zeichnungen 5 Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnungen näher beschrieben, dabei zeigen:BRIEF DESCRIPTION OF THE DRAWINGS 5 exemplary embodiments of the invention are described in more detail below with reference to the drawings, in which:
Figur 1 eine Wechselarmatur mit Tauchrohr in eingefahrener Ruhestellung, im Längsschnitt; ,oFigure 1 shows a retractable fitting with immersion tube in the retracted rest position, in longitudinal section; ,O
Figur 2 die Wechselarmatur der Figur 1, mit Tauchrohr in ausgefahrener Arbeitsstellung, im Längsschnitt;Figure 2 shows the retractable fitting of Figure 1, with a dip tube in the extended working position, in longitudinal section;
Figur 3 den vorderen Teil der Wechselarmatur der Figur 1 , in vergrösserter .5 Ansicht;Figure 3 shows the front part of the retractable fitting of Figure 1, in an enlarged .5 view;
Figur 4 den hinteren Teil der Wechselarmatur der Figur 1 , in vergrösserter Ansicht;Figure 4 shows the rear part of the retractable fitting of Figure 1, in an enlarged view;
o Figur 5 den hinteren Endbereich einer Wechselarmatur bei fehlendem Verschlussglied, im Längsschnitt; Figur 6 den hinteren Endbereich der Figur 5, bei fehlendem Einsatz, im Längsschnitt;5 shows the rear end area of a quick-change fitting in the absence of a locking member, in a longitudinal section; FIG. 6 shows the rear end area of FIG. 5, when not in use, in a longitudinal section;
Figur 7 den hinteren Endbereich der Figur 5, bei vorhandenem Verschlussglied und fehlendem Sensor, im Längsschnitt;FIG. 7 shows the rear end area of FIG. 5, with the closure member present and the sensor missing, in longitudinal section;
Figur 8 den hinteren Endbereich der Figur 5, in betriebsbereitem Zustand, im Längsschnitt.8 shows the rear end region of FIG. 5, in the operational state, in a longitudinal section.
Wege zur Ausführung der ErfindungWays of Carrying Out the Invention
Die in den Figuren 1 bis 4 dargestellte Wechselarmatur enthält einen Sensor 2, der herausnehmbar im Vorderteil 4 eines Tauchrohres 6 angeordnet ist. Das Tauchrohr 6 und damit der Sensor 2 sind bezüglich eines Gehäuses 8 zwischen einer eingefahrenen Ruhestellung und einer ausgefahrenen Arbeitsstellung axial verschiebbar. In der in Figur 1 dargestellten Ruhestellung befinden sich das Tauchrohr 6 und der Sensor 2 innerhalb des Gehäuses 8; in der in Figur 2 dargestellten Arbeitsstellung ist das Tauchrohr 6 mit dem Sensor 2 ausgefahren und taucht in ein nicht näher dargestelltes Reaktionsgefass ein, um Messwerte in einem darin befindlichen Medium zu ermitteln.The retractable fitting shown in Figures 1 to 4 contains a sensor 2, which is removably arranged in the front part 4 of an immersion tube 6. The dip tube 6 and thus the sensor 2 are axially displaceable with respect to a housing 8 between a retracted rest position and an extended work position. In the rest position shown in Figure 1, the dip tube 6 and the sensor 2 are located within the housing 8; In the working position shown in FIG. 2, the immersion tube 6 with the sensor 2 is extended and immersed in a reaction vessel (not shown in more detail) in order to determine measured values in a medium located therein.
Ein vorderer Mantelabschnitt 10 des Sensors 2 und ein im Vorderteil 4 des Tauchrohres 6 eingelassener O-Ring 12 bilden einen mediumdichten Abschluss des Tauchrohres 6. Des Weiteren enthält das Tauchrohr 6 einen herausnehmbaren, mittels eines Verschlussgliedes 14 fixierbaren, rohrartigen Einsatz 16, mittels welchem der Sensor 2 in eingesetzter Lage gegen einen vorderen Anschlag 18 des Tauchrohres 6 vorgeschoben ist. Im gezeigten Beispiel ist dieser vordere Anschlag 18 durch eine stufenartige Verengung im Inneren des Tauchrohres 6 gebildet, gegen welchen der Sensor 2 mit einem Vorsprung 20 des Sensorschaftes 22 ansteht.A front jacket section 10 of the sensor 2 and an O-ring 12 embedded in the front part 4 of the immersion tube 6 form a medium-tight closure of the immersion tube 6. Furthermore, the immersion tube 6 contains a removable, tube-like insert 16 which can be fixed by means of a closure member 14 and by means of which the Sensor 2 is inserted in the inserted position against a front stop 18 of the dip tube 6. In the example shown, this front stop 18 is formed by a step-like narrowing in the interior of the dip tube 6, against which the sensor 2 abuts with a projection 20 of the sensor shaft 22.
Wie aus den Figuren 1, 2 und 4 ersichtlich und nachfolgend noch näher erläutert, ist das Verschlussglied 14 am hinteren Ende 24 des Tauchrohres 6 einsetzbar und hält in eingesetzter Stellung den Einsatz 16 am Sensor 2 und letzteren am vorderen Anschlag 18.As can be seen from FIGS. 1, 2 and 4 and explained in more detail below, the closure member 14 can be inserted and held at the rear end 24 of the dip tube 6 in the inserted position, insert 16 on sensor 2 and the latter on front stop 18.
Die Wechselarmatur ist zudem mit einer Sicherungsvorrichtung 26 ausgestattet, die ein axiales Verschieben des Tauchrohres 6 aus der Ruhestellung verhindert, wenn mindestens eines der Bauteile: Sensor 2, Einsatz 16 und Verschlussglied 14 fehlt.The retractable assembly is also equipped with a securing device 26 which prevents the immersion tube 6 from being axially displaced from the rest position if at least one of the components: sensor 2, insert 16 and closure member 14 is missing.
Das Gehäuse 8 ist aus mehreren rohrartigen Bauteilen, nämlich einem vorderen Kammerteil 28, einem mittleren Kammerteil 30, einem zylinderförmigen Gehäuseteil 32 sowie einem hinteren Gehäuseteil 34, zusammengesetzt. Die einzelnen Kammerteile sind durch Verbindungsflansche und Befestigungsschrauben miteinander verbunden.The housing 8 is composed of several tubular components, namely a front chamber part 28, a middle chamber part 30, a cylindrical housing part 32 and a rear housing part 34. The individual chamber parts are connected to each other by connecting flanges and fastening screws.
Das Tauchrohr 6 weist am vorderen Ende einen Käfig 36 auf, der mit mindestens einer seitlichen Durchtrittsoffnung 38 versehen ist, um in ausgefahrener Messstellung den Zutritt von Messmedium zum Sensor 2 zu gewährleisten. Ausserdem weist derThe dip tube 6 has a cage 36 at the front end, which is provided with at least one lateral passage opening 38, in order to ensure the access of the measuring medium to the sensor 2 in the extended measuring position. In addition, the
Käfig 36 einen Boden 40 auf, der einen vorderen Abschluss des Tauchrohres bildet.Cage 36 on a bottom 40, which forms a front end of the dip tube.
Der Käfig 36 ist mit einem mittleren Tauchrohrteil 42 verschweisst, in dessenThe cage 36 is welded to a central dip tube part 42, in the
Innenwandung der besagte vordere Anschlag 18 für den Sensor 2 ausgebildet ist. An der dem Käfig 36 gegenüberliegenden Seite ist das mittlere Tauchrohrteil 42 mit einem Kolben 44 verbunden, der im zylindrischen Gehäuseteil 32 längsverschieblich gelagert ist. An der dem mittleren Tauchrohrteil 42 gegenüberliegenden Seite desInner wall of said front stop 18 is formed for the sensor 2. On the side opposite the cage 36, the middle dip tube part 42 is connected to a piston 44, which is mounted so as to be longitudinally displaceable in the cylindrical housing part 32. On the opposite side of the middle dip tube part 42
Kolbens 44 ist ein hinteres Tauchrohrteil 46 angeordnet, welcher am hinteren EndePiston 44 is a rear dip tube part 46 which is located at the rear end
24 mit einer Aufnahme für das Verschlussglied 14 ausgestattet ist. Wie insbesondere der Figur 3 entnehmbar, ist zwischen zusammenwirkenden Teilen des Gehäuses 8 und des Tauchrohres 6 eine Mehrzahl von Gleitlagern 48 vorgesehen.24 is equipped with a receptacle for the closure member 14. As can be seen in particular from FIG. 3, a plurality of slide bearings 48 is provided between interacting parts of the housing 8 and the immersion tube 6.
Das vordere Kammerteil 28 ist mit einem Anschlussflansch 50 ausgestattet, mittels welchem die Wechselarmatur an ein Reaktionsgefass anschliessbar ist. Da das vordere Kammerteil 28 als Bauteil des modular aufgebauten Gehäuses 8 ausgestaltet ist, lässt sich die Wechselarmatur an Reaktionsgefässe unterschiedlicher Anschlussmasse anschliessen, indem ein vorderes Kammerteil 28 mit entsprechend bemessenem Anschlussflansch 50 verwendet wird.The front chamber part 28 is equipped with a connecting flange 50, by means of which the retractable fitting can be connected to a reaction vessel. Since the front chamber part 28 is designed as a component of the modularly constructed housing 8, the retractable fitting can be attached to reaction vessels Connect different connection dimensions by using a front chamber part 28 with a correspondingly dimensioned connection flange 50.
Wie ebenfalls aus der Figur 3 hervorgeht, ist das vordere Kammerteil 28 als Teil einer Spülvorrichtung für den Sensor 2 ausgestaltet. Zu diesem Zweck weist das vordere Kammerteil 28 einen durch eine vordere Ringnut 52 und eine hintere Ringnut 54 begrenzten Spülbereich 56 auf, dessen Umfangswand 58 mindestens einen Zulauf 60 sowie einen Ablauf 62 für Spülmedium aufweist. In jeder Ringnut befindet sich ein entsprechender Dichtungsring, welcher mit der Aussenwandung des Tauchrohres 6 einen mediumdichten Abschluss des Spülbereichs 56 bildet. In eingefahrener Ruhestellung des Tauchrohres 6, welche auch einer Spülstellung für den Sensor 2 entspricht, befindet sich der Käfig 36 innerhalb des Spülbereichs 56. Somit kann durch den Zulauf 60 zugeführtes Spülmedium durch die seitliche Durchtrittsoffnung 38 des Käfigs 36 zum darin befindlichen Sensor 2 gelangen. Ein Austritt von Spülmedium in die Wechselarmatur wird dabei durch den zwischen dem Mantel 10 des Sensors 2 und der Innenwandung des Tauchrohres 6 angeordneten O-Ring 12 verhindert. In ausgefahrener Messstellung befindet sich im vorderen Kammerteil 28 ein öffnungsloser Teil des Tauchrohres 6, so dass sich der Spülbereich 56 auf den zwischen den beiden Ringnuten 52 und 54 befindlichen Zwischenraum zwischen der Aussenwandung des Tauchrohres 6 und der Umfangswand 58 beschränkt.As can also be seen from FIG. 3, the front chamber part 28 is designed as part of a flushing device for the sensor 2. For this purpose, the front chamber part 28 has a flushing area 56 delimited by a front ring groove 52 and a rear ring groove 54, the peripheral wall 58 of which has at least one inlet 60 and one outlet 62 for flushing medium. In each annular groove there is a corresponding sealing ring, which forms a medium-tight closure of the flushing area 56 with the outer wall of the immersion tube 6. In the retracted rest position of the immersion tube 6, which also corresponds to a rinsing position for the sensor 2, the cage 36 is located within the rinsing area 56. Thus, rinsing medium supplied through the inlet 60 can reach the sensor 2 located therein through the lateral passage opening 38 of the cage 36. An escape of flushing medium into the retractable fitting is prevented by the O-ring 12 arranged between the jacket 10 of the sensor 2 and the inner wall of the dip tube 6. In the extended measuring position, there is an opening-free part of the dip tube 6 in the front chamber part 28, so that the rinsing area 56 is limited to the space between the outer ring of the dip tube 6 and the peripheral wall 58 between the two annular grooves 52 and 54.
Zweckmässigerweise ist der Zulauf 60 und der Ablauf 62 mit einem Innengewindeabschnitt versehen, in welchen ein entsprechendes Anschlussteil oder aber, wie in den Figuren 1 bis 3 dargestellt, ein Verschlussstopfen einschraubbar ist. Letzteres ist beispielsweise für die Vornahme von Dichtigkeitsprüfungen nützlich.The inlet 60 and the outlet 62 are expediently provided with an internally threaded section into which a corresponding connecting part or, as shown in FIGS. 1 to 3, a sealing plug can be screwed. The latter is useful, for example, for performing leak tests.
Unter "Spülmedium" ist im vorliegenden Zusammenhang nicht nur eine eigentliche Spülflüssigkeit wie beispielsweise Wasser zu verstehen. Vielmehr umfasst dieser Begriff je nach Anwendungsfall auch diverse Reinigungsmedien, wie sie beispielsweise für die sogenannte CIP-Reinigung (engl. "Cleaning In Place") verwendet werden. Des Weiteren kann es sich um Wasserdampf, Spülgase, oder auch Kalibrierungsflüssigkeiten handeln. Insbesondere kann am Zulauf 60 und allenfalls auch am Ablauf 62 eine Vorrichtung zur Behandlung des Sensors angeschlossen sein, welche beispielsweise eine ganze Abfolge von Reinigungs-, Spülungs- und Kalibrierungsschritten erlaubt. Ausserdem kann bei Bedarf mehr als nur ein Zulauf bzw. Ablauf vorgesehen werden.In the present context, “rinsing medium” is not only to be understood as an actual rinsing liquid such as water. Rather, depending on the application, this term also includes various cleaning media, such as those used for so-called CIP cleaning ("Cleaning In Place"). Furthermore, it can be water vapor, purge gases, or also trade calibration fluids. In particular, a device for treating the sensor can be connected to the inlet 60 and possibly also to the outlet 62, which device allows, for example, a whole sequence of cleaning, rinsing and calibration steps. In addition, more than one inlet or outlet can be provided if required.
Der Sensor 2 hat einen rückwärtigen Steckkopf mit elektrischen Anschlüssen, auf den eine entsprechende Anschlussbuchse 64 mit Anschlusskabel 66 aufgesteckt ist. Die nach hinten stufenartig verjüngte Anschlussbuchse 64 ist von einer entsprechend abgestuften Mündung 68 des Einsatzes 16 hintersteckt, wobei das Anschlusskabel 66 im Einsatz 16 zum hinteren Ende 24 des Tauchrohres 6 und dort durch das Verschlussglied 14 nach aussen geführt ist. Wie bereits erwähnt, hält der Einsatz 16 den Sensor 2 gegen den vorderen Anschlag 18 des Tauchrohres 6. Somit sind Sensor 2 und Einsatz 16 nicht nur formmässig, sondern auch längenmässig aufeinander so abzustimmen, dass ihre kombinierte Länge annähernd der Tauchrohrlänge entspricht.The sensor 2 has a rear plug head with electrical connections, onto which a corresponding connection socket 64 with a connection cable 66 is attached. The connection socket 64, which tapers in steps towards the rear, is behind a correspondingly graduated mouth 68 of the insert 16, the connection cable 66 in the insert 16 being guided to the rear end 24 of the immersion tube 6 and out there through the closure member 14. As already mentioned, the insert 16 holds the sensor 2 against the front stop 18 of the dip tube 6. Thus, the sensor 2 and insert 16 are not only to be matched in terms of shape but also in terms of length such that their combined length corresponds approximately to the length of the dip tube.
Die Sicherungsvorrichtung 26, welche ein axiales Verschieben des Tauchrohres 6 aus der Ruhestellung verhindert, wenn der Sensor 2 oder der Einsatz 16 oder das Verschlussglied 14 oder eine Mehrzahl dieser Bauteile fehlt, ist wie folgt aufgebaut.The securing device 26, which prevents the immersion tube 6 from moving axially out of the rest position when the sensor 2 or the insert 16 or the closure member 14 or a plurality of these components is missing, is constructed as follows.
Wie insbesondere aus den Figuren 5 bis 8 hervorgeht, enthält das hintere Tauchrohrteil 46 einen Sicherungsschieber 70, welcher den rohrartigen Einsatz 16 an dessen hinterem Endbereich 72 hülsenartig umgreift. Der Sicherungsschieber 70 ist zwischen einem frontseitigen Anschlag und einem rückseitigen Anschlag innerhalb des hinteren Tauchrohrteiles 46 von einer ersten Sperrstellung S1 über eine Freigabestellung F zu einer zweiten Sperrstellung S2 verschiebbar. Im gezeigten Beispiel ist der frontseitige Anschlag durch eine absatzartige Verengung 74 im Inneren des hinteren Tauchrohrteiles 46 gebildet, während der rückseitige Anschlag durch einen in die Wandung des hinteren Tauchrohrteiles 46 eingeschraubten oder sonstwie befestigten Stift 76 gebildet ist. Die äussere Seitenwandung des Sicherungsschiebers 70 ist als Kulisse 78 für eine Mehrzahl von Sperrgliedem 80 ausgestaltet. Jedes Sperrglied 80 besteht aus einer Kugel, die in einer zugeordneten Durchgangsbohrung im hinteren Tauchrohrteil 46 radial verschieblich angeordnet ist.As can be seen in particular from FIGS. 5 to 8, the rear immersion tube part 46 contains a safety slide 70 which surrounds the tubular insert 16 at its rear end region 72 in a sleeve-like manner. The safety slide 70 is displaceable between a front stop and a rear stop within the rear dip tube part 46 from a first locking position S1 via a release position F to a second locking position S2. In the example shown, the front stop is formed by a shoulder-like constriction 74 in the interior of the rear dip tube part 46, while the rear stop is formed by a pin 76 screwed or otherwise fastened into the wall of the rear dip tube part 46. The outer side wall of the safety slide 70 is a backdrop 78 for a plurality of Designed locking member 80. Each locking member 80 consists of a ball which is arranged radially displaceably in an associated through hole in the rear dip tube part 46.
5 In der ersten Sperrstellung S1 steht der Sicherungsschieber 70 am rückseitigen Anschlag 76 an, wobei jedes Sperrglied 80 mit seiner Innenseite am vorderen Sperrbereich 84 der Kulisse 78 ansteht und dadurch mit seiner Aussenseite in eine Sperrausnehmung 86 des Gehäuses 8 eingreift. Die Sperrausnehmung 86 ist als Ringnut an der Innenwand des hinteren Gehäuseteils 34 ausgebildet. Durch diesen o Eingriff ist die axiale Verschiebbarkeit des Tauchrohres 6 gegenüber dem Gehäuse 8 gesperrt. In der zweiten Sperrstellung S2 steht der Sicherungsschieber 70 am frontseitigen Anschlag 74 an, wobei jedes Sperrglied 80 mit seiner Innenseite am hinteren Sperrbereich 88 der Kulisse 78 ansteht und dadurch wiederum mit seiner Aussenseite in die Sperrausnehmung 86 eingreift. Wie in der ersten Sperrstellung S1 i5 ist die axiale Verschiebbarkeit des Tauchrohres 6 gegenüber dem Gehäuse 8 gesperrt. In der Freistellung F befindet sich der Sicherungsschieber 70 im Bereich zwischen den beiden Anschlägen 74 und 76, so dass jedes Sperrglied 80 mit der Innenseite in eine mittige Umfangsnut 90 der Kulisse 78 eingreift und dadurch mit seiner Aussenseite aus der Sperrausnehmung 86 frei kommt, wodurch die axiale5 In the first locking position S1, the locking slide 70 is in contact with the rear stop 76, with each locking member 80 resting against the front locking area 84 of the link 78 with its inside and thereby engaging with its outside in a locking recess 86 of the housing 8. The locking recess 86 is formed as an annular groove on the inner wall of the rear housing part 34. The axial displacement of the dip tube 6 relative to the housing 8 is blocked by this engagement. In the second locking position S2, the safety slide 70 is in contact with the stop 74 on the front, each locking member 80 being in contact with the rear locking area 88 of the link 78 with its inside and thereby in turn engaging with the outside in the locking recess 86. As in the first blocking position S1 i5, the axial displaceability of the immersion tube 6 with respect to the housing 8 is blocked. In the release position F, the safety slide 70 is located in the area between the two stops 74 and 76, so that each locking member 80 engages with the inside in a central circumferential groove 90 of the link 78 and thereby comes out of the locking recess 86 with its outside, thereby removing the axial
>o Verschiebbarkeit des Tauchrohres 6 gegenüber dem Gehäuse 8 freigegeben wird.> o Slidability of the dip tube 6 relative to the housing 8 is released.
Wie insbesondere anhand der Figur 4 erkennbar, ist der Sicherungsschieber 70 mittels einer ersten Feder 92 gegen das hintere Ende 24 des Tauchrohres 6 vorgespannt und steht bei vorhandenem Einsatz 16 an einem hinteren Flansch 94 25 des Einsatzes 16 an. Am Verschlussglied 14 ist überdies eine zweite Feder 96 angeordnet, mittels welcher der Einsatz 16 und damit auch der Sicherungsschieber 70 gegen das vordere Ende des Tauchrohres 6 vorgespannt ist. Dabei ergibt sich die nachfolgend erläuterte Wirkungsweise der Sicherungsvorrichtung.As can be seen in particular from FIG. 4, the safety slide 70 is pretensioned against the rear end 24 of the dip tube 6 by means of a first spring 92 and is present on a rear flange 94 25 of the insert 16 when the insert 16 is present. A second spring 96 is also arranged on the closure member 14, by means of which the insert 16 and thus also the safety slide 70 is biased against the front end of the immersion tube 6. This results in the mode of operation of the safety device explained below.
30 a) Bei fehlendem Verschlussglied 14 fehlt die zweite Feder 96. Demnach wird der Sicherungsschieber 70 durch Einwirkung der ersten Feder 92 gegen den rückseitigen Anschlag 76, d.h. in der ersten Sperrstellung S1 gehalten, in welcher der vordere Sperrbereich 84 den Sperrgliedern 80 gegenüber steht (Figur 5). Dies ist unabhängig von der Anwesenheit des Sensors 2 und/oder des Schiebers 16.30 a) If the locking member 14 is missing, the second spring 96 is missing. Accordingly, the locking slide 70 is held in the first blocking position S1 by the action of the first spring 92 against the rear stop 76, ie the front blocking area 84 faces the blocking members 80 (FIG. 5). This is independent of the presence of the sensor 2 and / or the slide 16.
b) Bei fehlendem Einsatz 16 wird der Sicherungsschieber 70 - unabhängig davon, ob der Sensor 2 eingebaut ist oder nicht - durch Einwirkung der ersten Feder 92 gegen den rückseitigen Anschlag 76, d.h. in der ersten Sperrstellung S1 gehalten, in welcher der vordere Sperrbereich 84 den Sperrgliedern 80 gegenüber steht (Figur 6). Die zweite Feder 96 ist zwar vorhanden, bleibt aber wegen des fehlenden Einsatzes 16 wirkungslos.b) If there is no insert 16, the safety slide 70 is - regardless of whether the sensor 2 is installed or not - by the action of the first spring 92 against the rear stop 76, i.e. held in the first blocking position S1, in which the front blocking area 84 faces the blocking members 80 (FIG. 6). The second spring 96 is present, but remains ineffective due to the lack of an insert 16.
c) Bei vorhandenem Verschlussglied 24 und fehlendem Sensor 2 wird durch Einwirkung der zweiten Feder 96 der Einsatz 16 und damit auch der vom hinteren Flansch 94 mitgenommene Sicherungsschieber 70 gegen den frontseitigen Anschlag 74, d.h. in der zweiten Sperrstellung S2 gehalten, in welcher der hintere Sperrbereich 88 den Sperrgliedern 80 gegenüber steht (Figur 7). Wesentlich ist dabei, dass die Kraft der zweiten Feder 96 die entgegenwirkende Kraft der ersten Feder 92 übertrifft. Wegen des fehlenden Sensors 2 bleibt der vordere Anschlag 18 im Tauchrohr 6 wirkungslos.c) If the closure member 24 is present and the sensor 2 is missing, the action of the second spring 96 causes the insert 16 and thus also the safety slide 70 carried by the rear flange 94 against the front stop 74, i.e. held in the second blocking position S2, in which the rear blocking region 88 faces the blocking members 80 (FIG. 7). It is essential that the force of the second spring 96 exceeds the counteracting force of the first spring 92. Because of the missing sensor 2, the front stop 18 in the immersion tube 6 remains ineffective.
d) Im betriebsbereiten Zustand, d.h. bei vorhandenem Sensor 2, Einsatz 16 und Verschlussglied 14 wirken an sich dieselben Kräfteverhältnisse wie oben unter Punkt c) beschrieben. Wiederum wird der Einsatz 16 und damit auch der vom hinteren Flansch 94 mitgenommene Sicherungsschieber 70 nach vorne gedrängt. Allerdings wird die erste Sperrstellung S1 nicht erreicht, da der Sensord) In the operational state, i.e. if sensor 2, insert 16 and closure member 14 are present, the same force relationships as described above under point c) act. Again, the insert 16 and thus also the safety slide 70 entrained by the rear flange 94 are pushed forward. However, the first blocking position S1 is not reached because of the sensor
2 am vorderen Anschlag 18 im Tauchrohr 6 ansteht und dadurch ein weiteres Vorschieben des Einsatzes 16 verhindert. Im Ergebnis wird der Sicherungsschieber 70 in der Freigabestellung F gehalten, in welcher die mittige Umfaήgsnut 90 den Sperrgliedern 80 gegenüber steht. Aus dem Vorangehenden ist auch erkennbar, dass die Sicherungsvorrichtung 26 nicht nur auf fehlende, sondern auch auf falsch eingebaute oder falsch dimensionierte Bauteile anspricht. Dies ist nachfolgend noch näher erläutert.2 is present at the front stop 18 in the immersion tube 6, thereby preventing the insert 16 from advancing further. As a result, the safety slide 70 is held in the release position F, in which the central circumferential groove 90 is opposite the locking members 80. From the foregoing, it can also be seen that the securing device 26 responds not only to missing, but also to incorrectly installed or incorrectly dimensioned components. This is explained in more detail below.
Im Falle eines zu kurzen Sensors ist der vordere Anschlag 18 wirkungslos, d.h. der Sicherungsschieber 70 gelangt in die erste Sperrstellung S1. Bei zu langem Sensor hingegen kann der Einsatz 16 nicht genügend weit vorgeschoben werden, um die Freigabestellung F zu erreichen, so dass der Sicherungsschieber 70 in der zweiten Sperrstellung S2 verbleibt. Analoges gilt für einen zu kurzen oder zu langen Einsatz 16.If the sensor is too short, the front stop 18 has no effect, i.e. the safety slide 70 reaches the first blocking position S1. If the sensor is too long, on the other hand, the insert 16 cannot be advanced far enough to reach the release position F, so that the safety slide 70 remains in the second blocking position S2. The same applies to use that is too short or too long 16.
Wie aus den Figuren 5 bis 8 hervorgeht, ist das hintere Verschlussglied 14 mit einem seitlich vorstehenden Zapfen 98 versehen, der in einen zugeordneten L-förmigen Einfahrschlitz 100 am hinteren Ende 24 des Tauchrohres 6 eingreift. Durch Einführen und anschliessendes Verdrehen des Verschlussgliedes 14 wird dieses in eine gegenüber Längsverschiebung verriegelte Stellung gebracht. Bei unverriegelt eingesetztem Verschlussglied 14 wird dieses durch die erste Feder 92 aus dem Tauchrohr 6 gedrängt, woraufhin der Sicherungsschieber 70 in die erste Sperrstellung S1 geschoben wird.As can be seen from FIGS. 5 to 8, the rear closure member 14 is provided with a laterally projecting pin 98 which engages in an associated L-shaped insertion slot 100 at the rear end 24 of the dip tube 6. By inserting and then rotating the closure member 14, it is brought into a position locked against longitudinal displacement. When the locking member 14 is inserted unlocked, it is pushed out of the dip tube 6 by the first spring 92, whereupon the safety slide 70 is pushed into the first blocking position S1.
In einer nicht näher dargestellten Ausgestaltung sind der rohrartige Einsatz 16, die zweite Feder 96 und das Verschlussglied 14 je mit einer durchgehenden seitlichen Ausnehmung versehen. Bei der zweiten Feder 96 ist diese Ausnehmung durch eine an sich bekannte nicht-umlaufende Anordnung der Federwindungen bewerkstelligt, während sie beim Einsatz 16 und beim Verschlussglied 14 als durchgehender seitlicher Schlitz ausgestaltet ist. Da sich das Anschlusskabel 66 in die geschlitzten Bauteile ohne Einfädeln von der Seite her einlegen lässt, können beispielsweise auch Sensoren mit sperrigen Steckeranschlüssen, angebauten Vorverstärkern und dergleichen in die Wechselarmatur eingesetzt werden.In an embodiment not shown in detail, the tubular insert 16, the second spring 96 and the closure member 14 are each provided with a continuous lateral recess. In the case of the second spring 96, this recess is brought about by a known, non-rotating arrangement of the spring windings, while it is designed as a continuous lateral slot in the insert 16 and in the closure member 14. Since the connecting cable 66 can be inserted into the slotted components from the side without threading, sensors with bulky plug connections, attached preamplifiers and the like can also be inserted into the retractable fitting, for example.
Zweckmässigerweise ist die Wechselarmatur mit einer Verdrehsperre ausgestattet, die eine Drehung des Tauchrohres um seine Längsachse verhindert. Zu diesem Zweck ist beispielsweise das hintere Tauchrohrteil 46 mit einem Vorsprung versehen, der in einen zugeordneten Längsschlitz des hinteren Gehäuseteils 34 eingreift. Damit lässt sich einerseits eine definierte Ausrichtung der Durchtrittsöffnungen 38 im Käfig 36 gegenüber den Zu- und Abläufen des Spülbereichs 56 erreichen. Andererseits wird mit der Verdrehsperre sichergestellt, dass bei Verwendung eines nicht- rotationssymmetrischen Sensors dessen sensitive Fläche eine gewünschte Ausrichtung, beispielsweise bezüglich einer Strömungsrichtung im Reaktionsgefass, hat.The retractable fitting is expediently equipped with an anti-rotation lock which prevents the dip tube from rotating about its longitudinal axis. To this For example, the rear dip tube part 46 is provided with a projection which engages in an associated longitudinal slot of the rear housing part 34. On the one hand, this allows a defined alignment of the passage openings 38 in the cage 36 with respect to the inflows and outflows of the washing area 56. On the other hand, the rotation lock ensures that when a non-rotationally symmetrical sensor is used, its sensitive surface has a desired orientation, for example with respect to a flow direction in the reaction vessel.
Die Längsverschiebung des Kolbens 44 im zylindrischen Gehäuseteil 32 kann manuell oder mittels einer geeigneten Hydraulik-Vorrichtung erfolgen, welche beispielsweise mit Druckluft, Hydraulik-Öl, Wasser oder einem anderen geeigneten Fluidum betrieben wird. Zweckmässigerweise sind zudem Positionsrückmelder vorhanden, mittels welcher die Längsposition des Tauchrohres feststellbar ist.The longitudinal displacement of the piston 44 in the cylindrical housing part 32 can be carried out manually or by means of a suitable hydraulic device, which is operated, for example, with compressed air, hydraulic oil, water or another suitable fluid. Position feedback devices are also expediently provided, by means of which the longitudinal position of the dip tube can be determined.
Wie aus der Figur 2 ersichtlich ist, befindet sich das hintere Ende 24 des Tauchrohres 6 sowie das darin eingesetzte Verschlussglied 14 in der ausgefahrenen Arbeitsstellung im Inneren des hinteren Gehäuseteils 34, womit das Verschlussglied 14 nicht ohne weiteres zugänglich ist. Damit wird ein versehentliches Entfernen des Verschlussgliedes 14 in der ausgefahrenen Arbeitsstellung verhindert. Dies stellt insbesondere bei einem unter Druck stehenden Reaktionsgefass eine zusätzliche Absicherung gegen ein unerwünschtes Austreten von Reaktionsmedium dar.As can be seen from FIG. 2, the rear end 24 of the immersion tube 6 and the closure member 14 inserted therein are in the extended working position inside the rear housing part 34, so that the closure member 14 is not easily accessible. This prevents inadvertent removal of the closure member 14 in the extended working position. In the case of a pressurized reaction vessel in particular, this represents an additional safeguard against undesired escape of the reaction medium.
Obwohl die Wechselarmatur jeweils in horizontaler Einbaulage gezeigt wurde, ist sie grundsätzlich auch für eine vertikale Einbaulage mit nach unten weisendem Sensorteil sowie für dazwischen liegende Einbaulagen verwendbar. BezugszeichenlisteAlthough the retractable fitting has been shown in a horizontal installation position, it can basically also be used for a vertical installation position with the sensor part pointing downwards and for installation positions in between. LIST OF REFERENCE NUMBERS
2 Sensor2 sensor
4 Vorderteil von 64 front part of 6
6 Tauchrohr6 dip tube
8 Gehäuse8 housing
10 vorderer Mantelabschnitt von 210 front jacket section of 2
12 O-Ring12 O-ring
14 Verschlussglied14 closure member
16 Einsatz16 use
18 vorderer Anschlag von 618 front stop of 6
20 Vorsprung von 2220 lead from 22
22 Sensorschaft22 sensor shaft
24 hinteres Ende von 624 rear end of 6
26 Sicherungsvorrichtung26 safety device
28 vorderes Kammerteil von 828 front chamber part of 8
30 mittleres Kammerteil30 middle part of the chamber
32 zylindrisches Gehäuseteil32 cylindrical housing part
34 hinteres Gehäuseteil34 rear housing part
36 Käfig von 636 cage of 6
38 Durchtrittsoffnung von 3638 opening of 36
40 Boden von 3640 floor of 36
42 mittleres Tauchrohrteil42 middle dip tube part
44 Kolben44 pistons
46 hinteres Tauchrohrteil46 rear dip tube part
48 Gleitlager48 plain bearings
50 Anschlussflansch von 2850 connection flange of 28
52 vordere Ringnut52 front ring groove
54 hintere Ringnut54 rear ring groove
56 Spülbereich56 rinsing area
58 Umfangswand von 5658 peripheral wall of 56
60 Zulauf Ablauf Anschlussbuchse Anschlusskabel vordere Mündung von 16 Sicherungsschieber hinterer Endbereich von 16 frontseitiger Anschlag rückseitiger Anschlag Aussenwand (Kulisse) von 70 Sperrglied vorderer Sperrbereich von 78 Sperrausnehmung hinterer Sperrbereich von 78 mittige Umfangsnut von 78 erste Feder hinterer Flansch von 16 zweite Feder Zapfen von 14 Einfahrschlitz für 98 60 inflow Drain connection socket connecting cable front mouth of 16 safety slides rear end area of 16 front stop back stop outer wall (backdrop) of 70 locking element front locking area of 78 locking recess rear locking area of 78 central circumferential groove of 78 first spring rear flange of 16 second spring pin of 14 entry slot for 98

Claims

Patentansprüche claims
1. Wechselarmatur mit einem Sensor (2), der herausnehmbar im Vorderteil (4) eines Tauchrohres (6) angeordnet ist, welches in einem Gehäuse (8) zwischen einer eingefahrenen Ruhestellung und einer ausgefahrenen Arbeitsstellung axial verschiebbar ist, wobei der Sensor (2) in eingesetzter Lage einen mediumdichten Abschluss (10, 12) des Tauchrohres (6) bildet, dadurch gekennzeichnet, dass das Tauchrohr (6) einen herausnehmbaren, mittels eines Verschlussgliedes (14) fixierbaren Einsatz (16) enthält, mittels welchem der Sensor (2) in eingesetzter Lage gegen einen vorderen Anschlag (18) des Tauchrohres (6) vorgeschoben ist, wobei eine Sicherungsvorrichtung (26) vorhanden ist, die ein axiales Verschieben des Tauchrohres (6) aus der Ruhestellung verhindert, wenn mindestens eines der Bauteile: Sensor (2), Einsatz (16) und Verschlussglied (14) fehlt.1. retractable assembly with a sensor (2), which is removably arranged in the front part (4) of an immersion tube (6), which is axially displaceable in a housing (8) between a retracted rest position and an extended working position, the sensor (2) in the inserted position forms a medium-tight end (10, 12) of the immersion tube (6), characterized in that the immersion tube (6) contains a removable insert (16) which can be fixed by means of a closure member (14) and by means of which the sensor (2) is pushed against a front stop (18) of the dip tube (6) in the inserted position, a securing device (26) being present which prevents the dip tube (6) from being moved axially out of the rest position if at least one of the components: sensor (2 ), Insert (16) and closure member (14) are missing.
2. Wechselarmatur nach Anspruch 1 , dadurch gekennzeichnet, dass der Einsatz (16) rohrartig ausgebildet ist und eine vordere Stirnseite (68) aufweist, die gegen eine zugeordnete rückwärtige Stirnseite (64) des Sensors (2) ansteht.2. Retractable fitting according to claim 1, characterized in that the insert (16) is tubular and has a front end face (68) which bears against an associated rear end face (64) of the sensor (2).
3. Wechselarmatur nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Verschlussglied (14) am hinteren Ende (24) des Tauchrohres (6) einsetzbar ist und in eingesetzter Stellung den Einsatz (16) am Sensor (2) und letzteren am vorderen Anschlag (18) hält.3. Retractable fitting according to claim 1 or 2, characterized in that the closure member (14) at the rear end (24) of the dip tube (6) can be used and in the inserted position the insert (16) on the sensor (2) and the latter at the front stop (18) holds.
4. Wechselarmatur nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass die Sicherungsvorrichtung (26) einen das hintere Ende (72) des Einsatzes (16) hülsenartig umgreifenden Sicherungsschieber (70) aufweist, der zwischen einem frontseitigen Anschlag (74) und einem rückseitigen Anschlag (76) innerhalb des Tauchrohres (6) von einer ersten Sperrstellung (S1) über eine Freigabestellung (F) zu einer zweiten Sperrstellung (S2) verschiebbar ist, wobei der Sicherungsschieber (70) mit mindestens einem Sperrglied (80) zusammenwirkt, das radial verschieblich im Tauchrohr (6) angeordnet ist und in Sperrstellung (S1, S2) des Sicherungsschiebers (70) mit seiner Innenseite am Mantel (78; 84, 88) des Sicherungsschiebers (70) ansteht und mit seiner Aussenseite in eine Sperrausnehmung (86) im Gehäuse (8) eingreift beziehungsweise in Freistellung (F) des Sicherungsschiebers (70) mit der Innenseite in eine Umfangsnut (90) im Sicherungsschieber (70) eingreift und mit seiner Aussenseite aus der Sperrausnehmung (86) des Gehäuses (8) frei kommt.4. Retractable fitting according to claim 1, 2 or 3, characterized in that the securing device (26) has a rear end (72) of the insert (16) sleeve-like locking slide (70) between a front stop (74) and one rear stop (76) within the immersion tube (6) from a first locking position (S1) via a release position (F) to a second locking position (S2) is displaceable, the safety slide (70) cooperating with at least one locking member (80) that is arranged radially displaceably in the immersion tube (6) and in the blocking position (S1, S2) of the safety slide (70) with its inside on the casing (78; 84, 88) of the safety slide (70) and engages with its outside in a locking recess (86) in the housing (8) or in the release position (F) of the safety slide ( 70) engages with the inside in a circumferential groove (90) in the safety slide (70) and with its outside comes out of the locking recess (86) of the housing (8).
5. Wechselarmatur nach Anspruch 4, dadurch gekennzeichnet, dass der Sicherungsschieber (70) mittels einer ersten Feder (92) gegen das hintere Ende (24) des Tauchrohres (6) vorgespannt ist und bei vorhandenem Einsatz (16) an einem hinteren Flansch (94) des Einsatzes (16) ansteht, wobei am Verschlussglied (14) eine zweite Feder (96) angeordnet ist, mittels welcher der Einsatz (16) gegen das vordere Ende (4) des Tauchrohres (6) vorgespannt ist, das Ganze derart, dass:5. Retractable fitting according to claim 4, characterized in that the safety slide (70) is biased by means of a first spring (92) against the rear end (24) of the immersion tube (6) and, if there is an insert (16), on a rear flange (94 ) of the insert (16), wherein a second spring (96) is arranged on the closure member (14), by means of which the insert (16) is biased against the front end (4) of the immersion tube (6), the whole in such a way that :
a) bei fehlendem Verschlussglied (14) der Sicherungsschieber (70) mit einem vorderen Sperrbereich (84) dem Sperrglied (80) gegenüber steht (S1);a) in the absence of a locking member (14) the locking slide (70) with a front locking area (84) opposite the locking member (80) (S1);
b) bei fehlendem Einsatz (16) der Sicherungsschieber (70) mit dem vorderen Sperrbereich (84) dem Sperrglied (80) gegenüber steht (S1);b) in the absence of use (16) of the safety slide (70) with the front locking area (84) opposite the locking member (80) (S1);
c) bei vorhandenem Verschlussglied (14) und fehlendem Sensor (2) der Sicherungsschieber (70) mit einem hinteren Sperrbereich (88) dem Sperrglied (80) gegenüber steht (S2); und:c) if the locking member (14) is present and the sensor (2) is missing, the safety slide (70) with a rear locking area (88) faces the locking member (80) (S2); and:
d) in betriebsbereitem Zustand der Sicherungsschieber (14) mit einer mittigen Umfangsnut (90) dem Sperrglied (80) gegenüber steht (F).d) in the operational state of the safety slide (14) with a central circumferential groove (90) opposite the locking member (80) (F).
6. Wechselarmatur nach Anspruch 5, dadurch gekennzeichnet, dass der Einsatz (16), die zweite Feder (96) und das Verschlussglied (14) je mit einer durchgehenden seitlichen Ausnehmung versehen sind. 6. Retractable fitting according to claim 5, characterized in that the insert (16), the second spring (96) and the closure member (14) are each provided with a continuous lateral recess.
7. Wechselarmatur nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass ein vorderer Teil des Gehäuses (8) einen Spülbereich (56) mit mindestens einem Zulauf (60) und einem Ablauf (62) für Spülmedium beinhaltet.7. Retractable fitting according to one of claims 1 to 6, characterized in that a front part of the housing (8) includes a rinsing area (56) with at least one inlet (60) and an outlet (62) for rinsing medium.
5 8. Wechselarmatur nach Anspruch 7, dadurch gekennzeichnet, dass der5 8. retractable valve according to claim 7, characterized in that the
Spülbereich (56) durch eine vordere und eine hintere Ringdichtung (52, 54) begrenzt ist, welche zusammen mit zugeordneten äusseren Mantelteilen des Tauchrohres (6) mediumdichte Abschlüsse bilden.Rinsing area (56) is delimited by a front and a rear ring seal (52, 54) which, together with assigned outer jacket parts of the immersion tube (6), form medium-tight seals.
3 9. Wechselarmatur nach Anspruch 8, dadurch gekennzeichnet, dass das Tauchrohr (6) am vorderen Ende (4; 40) abgeschlossen ist und mindestens eine seitliche Öffnung (38) aufweist, welche in einer Spülstellung des Tauchrohres zwischen der vorderen und hinteren Ringdichtung (52, 54) liegt.3 9. Retractable fitting according to claim 8, characterized in that the immersion tube (6) at the front end (4; 40) is closed and has at least one side opening (38), which in a rinsing position of the immersion tube between the front and rear ring seals ( 52, 54).
5 10. Wechselarmatur nach Anspruch 9, dadurch gekennzeichnet, dass die Spülstellung des Tauchrohres der eingefahrenen Ruhestellung entspricht.5 10. Retractable fitting according to claim 9, characterized in that the rinsing position of the dip tube corresponds to the retracted rest position.
11. Wechselarmatur nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das Tauchrohr (6) einen als Kolben (44) ausgebildeten Abschnitt aufweist, o der in einem zylinderförmigen Abschnitt (32) des Gehäuses (8) zwischen der eingefahrenen Ruhestellung und der ausgefahrenen Arbeitsstellung verschiebbar gelagert ist.11. Retractable assembly according to one of claims 1 to 10, characterized in that the immersion tube (6) has a section designed as a piston (44), o in a cylindrical section (32) of the housing (8) between the retracted rest position and the extended working position is slidably mounted.
12. Wechselarmatur nach Anspruch 11, dadurch gekennzeichnet, dass sie eine 5 mittels Fluid betriebene Antriebsvorrichtung zum axialen Verschieben des12. Retractable assembly according to claim 11, characterized in that it has a 5 fluid operated drive device for axially displacing the
Tauchrohres (6) aufweist. Dip tube (6).
EP03793822A 2002-09-09 2003-09-01 Retractable housing comprising a sensor Expired - Lifetime EP1540322B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10241833 2002-09-09
DE10241833A DE10241833A1 (en) 2002-09-09 2002-09-09 Retractable fitting with one sensor
PCT/EP2003/050604 WO2004023127A1 (en) 2002-09-09 2003-09-01 Interchangeable fitting comprising a sensor

Publications (2)

Publication Number Publication Date
EP1540322A1 true EP1540322A1 (en) 2005-06-15
EP1540322B1 EP1540322B1 (en) 2006-01-11

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EP03793822A Expired - Lifetime EP1540322B1 (en) 2002-09-09 2003-09-01 Retractable housing comprising a sensor

Country Status (8)

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US (1) US7272983B2 (en)
EP (1) EP1540322B1 (en)
JP (1) JP4606164B2 (en)
CN (1) CN100419415C (en)
AT (1) ATE315780T1 (en)
AU (1) AU2003298426A1 (en)
DE (2) DE10241833A1 (en)
WO (1) WO2004023127A1 (en)

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Also Published As

Publication number Publication date
ATE315780T1 (en) 2006-02-15
US7272983B2 (en) 2007-09-25
WO2004023127A1 (en) 2004-03-18
CN100419415C (en) 2008-09-17
AU2003298426A1 (en) 2004-03-29
JP4606164B2 (en) 2011-01-05
DE10241833A1 (en) 2004-03-18
JP2005538318A (en) 2005-12-15
US20050229727A1 (en) 2005-10-20
CN1682109A (en) 2005-10-12
EP1540322B1 (en) 2006-01-11
DE50302206D1 (en) 2006-04-06

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